A POLARIZED- LIGHT CONVERTING OPTICAL SYSTEM, A POLARIZED- LIGHT CONVERTING ELEMENTAL DEVICE, A POLARIZED- LIGHT CONVERTING ELEMENTAL DEVICE ARRAY AND A PROJECTION- TYPE DISPLAY DEVICE USING ANY ONE OF THOSE COMPONENTS

摘要

A POLARIZED-LIGHT CONVERTING ELEMENTAL DEVICE WHICH CAN PRODUCE AN ACCURATELY UNIDIRECTIONALLY AND CIRCULARLY POLARIZED LIGHT WITH A MINIMIZED LOSS OF LIGHT AND A PROJECTION-TYPE DISPLAY DEVICE USING SAID UNIDIRECTIONALLY-POLARIZED-LIGHT CONVERTING ELEMENTAL DEVICE ARE PROVIDED. A POLARIZED LIGHT CONVERTING ELEMENTAL DEVICE COMPRISES A MIRROR GLASS PORTION CONSISTING OF AN ARRAY OF MIRROR GLASS BLOCKS (7) EACH HAVING A FIRST REFLECTING OPTICAL ELEMENT (8) AND A SECOND REFLECTING OPTICAL ELEMENT (9) AND A CHOLESTERIC-LIQUID-CRYSTAL GLASS PORTION (1) INCLUDING A CHOLESTERIC LIQUID CRYSTAL LAYER (3) FOR REFLECTING EITHER CLOCKWISE CIRCULARLY POLARIZED COMPONENT OR ANTICLOCKWISE CIRCULARLY POLARIZED COMPONENT AND TRANSMITTING THE OTHER. NATURAL LIGHT FROM THE LEFT SIDE IS SPLIT INTO TWO DIRECTIONS BY THE FIRST REFLECTING OPTICAL ELEMENT (8). LIGHT REFLECTED FROM THE CHOLESTERIC LIQUID CRYSTAL (3) IS REFLECTED BY THE SECOND REFLECTING OPTICAL ELEMENT (9) TO ALTER ITS ROTATION DIRECTION AND THEN TRANSMITTED THROUGH THE CHOLESTERIC LIQUID CRYSTAL. THE CONSTRUCTION OF THE ELEMENT CAN OBTAIN OUTGOING LIGHT BEAMS HAVING THE SAME ROTATION DIRECTION AND PROPAGATE IN TWO DEPARTING DIRECTIONS. A PROJECTION-TYPE DISPLAY DEVICE USING THE UNIDIRECTIONALLY POLARIZED LIGHT PRODUCING ELEMENT IS ALSO PROVIDED (NOT SHOWN).